Benjamin Peterson <benja...@python.org> added the comment:

2012/4/26 Q <rep...@bugs.python.org>:
> issubclass(obj.__class__, object)
>
> to be the official way to distinguish between the new-style and the old-style 
> classes?

Just do type(cls) is types.ClassType.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14671>
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